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Robust Delay Compensation Strategy for LCL-Type Grid-Connected Inverter in Weak Grid
Capacitor-current-feedback active damping has been widely adopted in digitally controlled LCL-type grid-connected inverters (GCIs). However, their digital control delay causes the system stability to deteriorate within a negative damping range. Particularly, in a weak grid, such GCIs are prone to be unstable against the grid impedance variation. To address the above problem, a delay compensation strategy is proposed for an LCL-type GCI, in which a second-order low-pass filter (LPF) is inserteddoi:10.1109/access.2022.3176957 fatcat:3rmruoyykzeqfmoco7giz4cghe